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    • 7. 发明申请
    • PROCESS FOR PRODUCING POLYETHYLENE WITH IMPROVED HOMOGENEITY
    • 生产具有改善的均匀性的聚乙烯的方法
    • WO2012034869A1
    • 2012-03-22
    • PCT/EP2011/065135
    • 2011-09-01
    • BOREALIS AGLENTZAKIS, HelenLYLYKANGAS, MikkoBERGSTRA, MichielVAHTERI, MarkkuAHO, Jani
    • LENTZAKIS, HelenLYLYKANGAS, MikkoBERGSTRA, MichielVAHTERI, MarkkuAHO, Jani
    • C08F10/02
    • C08F210/16C08F10/00C08F2/001C08F210/08C08F2500/01C08F2500/05C08F2500/08C08F2500/12C08F2500/26C08F2500/02C08F2500/07C08F4/6555C08F4/6492
    • Process for producing polyethylene compositions, like LLDPE, MDPE or HDPE, with a high level of homogeneity which comprises the steps of a) preactivating the total amount of a Ziegler-Natta procatalyst with the total amount of a cocatalyst, which cocatalyst comprises an organoaluminium compound, in order to get a preactivated Ziegler-Natta catalyst system, b) introducing the preactivated Ziegler-Natta catalyst system into a prepolymerisation reactor, wherein the preactivated Ziegler-Natta catalyst system is prepolymerised with at least one C 2 -C 10 -alpha-olefin monomer and optionally one or more C 3 -C 10 -alpha- olefin comonomer, in order to get a prepolymerisation product, c) introducing the prepolymerisation product into a first polymerisation reactor, which comprises a slurry reactor, wherein the prepolymerisation product is further polymerised with ethylene monomers and optionally one or more C 3 -C 10 -alpha-olefin comonomers in order to get a first polymerisation product, d) introducing the first polymerisation product into a second polymerisation reactor, wherein the first polymerisation product is further polymerised with ethylene monomers and optionally one or more C 3 to C 10 -alpha-olefin comonomers in order to get a second polymerisation product, e) optionally performing one or two subsequent polymerisation steps in order to get a third or fourth polymerisation product, f) further processing the obtained polymerisation product into pellets by extrusion; its use for forming articles, especially films with a low gel content.
    • 用于生产具有高水平均匀性的聚乙烯组合物如LLDPE,MDPE或HDPE的方法,其包括以下步骤:a)预先活化齐格勒 - 纳塔前催化剂的总量与助催化剂的总量,该助催化剂包含有机铝化合物 ,以便获得预活化的齐格勒 - 纳塔催化剂体系,b)将预活化的齐格勒 - 纳塔催化剂体系引入预聚合反应器,其中预活化的齐格勒 - 纳塔催化剂体系与至少一种C2-C10-α-烯烃单体 和任选的一种或多种C 3 -C 10-α-烯烃共聚单体,以获得预聚合产物,c)将预聚合产物引入第一聚合反应器,该反应器包括浆料反应器,其中预聚合产物进一步与乙烯单体 和任选的一种或多种C 3 -C 10-α-烯烃共聚单体,以获得第一聚合产物,d)引入t 他将第一聚合产物转化成第二聚合反应器,其中第一聚合产物进一步与乙烯单体和任选的一种或多种C 3 -C 10-α-烯烃共聚单体聚合,以获得第二聚合产物,e)任选地进行一个或两个 随后的聚合步骤以获得第三或第四聚合产物,f)通过挤出将所得聚合产物进一步加工成颗粒; 其用于形成制品,特别是具有低凝胶含量的膜。